File I/O, Exception, Assertion COL 100 - Introduction to Computer - PowerPoint PPT Presentation

File I/O, Exception, Assertion COL 100 - Introduction to Computer Science Department of Computer Science and Engineering Indian Institute of Technology Delhi

Reading and Writing Files It is a common task to • read some input data file • do some calculation/filtering/processing with the data • write some output data file with results Python distinguishes between • text files ('t') • binary files 'b') If we don’t specify the file type, Python assumes we mean text files.

Reading and Writing Files Writing a text file https://www.southampton.ac.uk/~fangohr/training/python/pdfs/Python-for-Computational-Science-and-Engineering.pdf

Reading and Writing Files Writing a text file https://www.southampton.ac.uk/~fangohr/training/python/pdfs/Python-for-Computational-Science-and-Engineering.pdf

Reading and Writing Files Reading a text file https://www.southampton.ac.uk/~fangohr/training/python/pdfs/Python-for-Computational-Science-and-Engineering.pdf

Reading and Writing Files Reading a text file https://www.southampton.ac.uk/~fangohr/training/python/pdfs/Python-for-Computational-Science-and-Engineering.pdf

Reading and Writing Files Exercise https://www.southampton.ac.uk/~fangohr/training/python/pdfs/Python-for-Computational-Science-and-Engineering.pdf

Reading and Writing Files Exercise https://www.southampton.ac.uk/~fangohr/training/python/pdfs/Python-for-Computational-Science-and-Engineering.pdf

Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/

Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/

Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/

Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/

Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/

Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/

Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/

Exceptions

Exceptions

Assertion • Want to be sure that assumptions on state of computation are as expected • use an assert statement to raise an exception • an example of good defensive programming

Assertion Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/

Assertion Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/